]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * linux/fs/ext4/file.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/file.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * ext4 fs regular file handling primitives | |
16 | * | |
17 | * 64-bit file support on 64-bit platforms by Jakub Jelinek | |
18 | * (jj@sunsite.ms.mff.cuni.cz) | |
19 | */ | |
20 | ||
21 | #include <linux/time.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/jbd2.h> | |
24 | #include <linux/mount.h> | |
25 | #include <linux/path.h> | |
26 | #include <linux/quotaops.h> | |
27 | #include "ext4.h" | |
28 | #include "ext4_jbd2.h" | |
29 | #include "xattr.h" | |
30 | #include "acl.h" | |
31 | ||
32 | /* | |
33 | * Called when an inode is released. Note that this is different | |
34 | * from ext4_file_open: open gets called at every open, but release | |
35 | * gets called only when /all/ the files are closed. | |
36 | */ | |
37 | static int ext4_release_file(struct inode *inode, struct file *filp) | |
38 | { | |
39 | if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) { | |
40 | ext4_alloc_da_blocks(inode); | |
41 | ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); | |
42 | } | |
43 | /* if we are the last writer on the inode, drop the block reservation */ | |
44 | if ((filp->f_mode & FMODE_WRITE) && | |
45 | (atomic_read(&inode->i_writecount) == 1) && | |
46 | !EXT4_I(inode)->i_reserved_data_blocks) | |
47 | { | |
48 | down_write(&EXT4_I(inode)->i_data_sem); | |
49 | ext4_discard_preallocations(inode); | |
50 | up_write(&EXT4_I(inode)->i_data_sem); | |
51 | } | |
52 | if (is_dx(inode) && filp->private_data) | |
53 | ext4_htree_free_dir_info(filp->private_data); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static ssize_t | |
59 | ext4_file_write(struct kiocb *iocb, const struct iovec *iov, | |
60 | unsigned long nr_segs, loff_t pos) | |
61 | { | |
62 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; | |
63 | ||
64 | /* | |
65 | * If we have encountered a bitmap-format file, the size limit | |
66 | * is smaller than s_maxbytes, which is for extent-mapped files. | |
67 | */ | |
68 | ||
69 | if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) { | |
70 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
71 | size_t length = iov_length(iov, nr_segs); | |
72 | ||
73 | if (pos > sbi->s_bitmap_maxbytes) | |
74 | return -EFBIG; | |
75 | ||
76 | if (pos + length > sbi->s_bitmap_maxbytes) { | |
77 | nr_segs = iov_shorten((struct iovec *)iov, nr_segs, | |
78 | sbi->s_bitmap_maxbytes - pos); | |
79 | } | |
80 | } | |
81 | ||
82 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
83 | } | |
84 | ||
85 | static const struct vm_operations_struct ext4_file_vm_ops = { | |
86 | .fault = filemap_fault, | |
87 | .page_mkwrite = ext4_page_mkwrite, | |
88 | }; | |
89 | ||
90 | static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) | |
91 | { | |
92 | struct address_space *mapping = file->f_mapping; | |
93 | ||
94 | if (!mapping->a_ops->readpage) | |
95 | return -ENOEXEC; | |
96 | file_accessed(file); | |
97 | vma->vm_ops = &ext4_file_vm_ops; | |
98 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static int ext4_file_open(struct inode * inode, struct file * filp) | |
103 | { | |
104 | struct super_block *sb = inode->i_sb; | |
105 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
106 | struct vfsmount *mnt = filp->f_path.mnt; | |
107 | struct path path; | |
108 | char buf[64], *cp; | |
109 | ||
110 | if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) && | |
111 | !(sb->s_flags & MS_RDONLY))) { | |
112 | sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED; | |
113 | /* | |
114 | * Sample where the filesystem has been mounted and | |
115 | * store it in the superblock for sysadmin convenience | |
116 | * when trying to sort through large numbers of block | |
117 | * devices or filesystem images. | |
118 | */ | |
119 | memset(buf, 0, sizeof(buf)); | |
120 | path.mnt = mnt; | |
121 | path.dentry = mnt->mnt_root; | |
122 | cp = d_path(&path, buf, sizeof(buf)); | |
123 | if (!IS_ERR(cp)) { | |
124 | memcpy(sbi->s_es->s_last_mounted, cp, | |
125 | sizeof(sbi->s_es->s_last_mounted)); | |
126 | sb->s_dirt = 1; | |
127 | } | |
128 | } | |
129 | return dquot_file_open(inode, filp); | |
130 | } | |
131 | ||
132 | const struct file_operations ext4_file_operations = { | |
133 | .llseek = generic_file_llseek, | |
134 | .read = do_sync_read, | |
135 | .write = do_sync_write, | |
136 | .aio_read = generic_file_aio_read, | |
137 | .aio_write = ext4_file_write, | |
138 | .unlocked_ioctl = ext4_ioctl, | |
139 | #ifdef CONFIG_COMPAT | |
140 | .compat_ioctl = ext4_compat_ioctl, | |
141 | #endif | |
142 | .mmap = ext4_file_mmap, | |
143 | .open = ext4_file_open, | |
144 | .release = ext4_release_file, | |
145 | .fsync = ext4_sync_file, | |
146 | .splice_read = generic_file_splice_read, | |
147 | .splice_write = generic_file_splice_write, | |
148 | }; | |
149 | ||
150 | const struct inode_operations ext4_file_inode_operations = { | |
151 | .truncate = ext4_truncate, | |
152 | .setattr = ext4_setattr, | |
153 | .getattr = ext4_getattr, | |
154 | #ifdef CONFIG_EXT4_FS_XATTR | |
155 | .setxattr = generic_setxattr, | |
156 | .getxattr = generic_getxattr, | |
157 | .listxattr = ext4_listxattr, | |
158 | .removexattr = generic_removexattr, | |
159 | #endif | |
160 | .check_acl = ext4_check_acl, | |
161 | .fallocate = ext4_fallocate, | |
162 | .fiemap = ext4_fiemap, | |
163 | }; | |
164 |